Light travels a distance x in time t 1 in air and 10x in time t 2 in another denser medium. What is the critical angle for this medium?

1. A. -1 ( t 2 t 1 )
2. B. -1 ( 10t 2 t 1 )
3. C. -1 ( t 1 10t 2 )
4. D. -1 ( 10t 1 t 2 )

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